CN212010879U

CN212010879U - Bimetal assembly with additional resistor

Info

Publication number: CN212010879U
Application number: CN202021009905.2U
Authority: CN
Inventors: 包健健
Original assignee: Zhejiang Tiansheng Shuangjin Technology Co ltd
Current assignee: Zhejiang Tiansheng Shuangjin Technology Co ltd
Priority date: 2020-06-04
Filing date: 2020-06-04
Publication date: 2020-11-24
Anticipated expiration: 2030-06-04

Abstract

The utility model relates to a control by temperature change electronic component makes technical field, concretely relates to with bimetallic assembly of an additional resistance. The utility model discloses a bimetallic strip, the winding has the insulating layer outside the centre of bimetallic strip, bimetallic strip divide into contact zone, lower contact zone under the insulating layer winding, the resistance card is installed to the insulating layer, the one end welding of resistance card is in last contact zone, the resistance card becomes serpentine structure, the thickness of resistance card is unanimous. The beneficial effects of the utility model are that the form that adopts the coil strip material replaces original resistance silk material, and different overall dimension can be made with the punching machine to same kind of winding according to the demand, only needs to switch the resistance value that the mould just can obtain the design. The stock specifications of various original spare resistance wires are reduced, the resistance precision control of the resistance card is extremely high, and the operating requirements of personnel are extremely low.

Description

Bimetal assembly with additional resistor

Technical Field

The utility model relates to a control by temperature change electronic component makes technical field, concretely relates to with bimetallic assembly of an additional resistance.

Background

The production of circuit breakers or thermal relays often involves a low amperage specification, which causes the circuit breaker to generate too low heat due to too low current, which can cause the bimetal to deform too little, making the circuit breaker insensitive. The solution is to increase the heat productivity, for example, a bimetal with a large resistance is selected, but the small ampere current is usually small in volume and space, and the heat productivity is usually additionally increased to solve the problem.

Chinese utility model patent publication No. CN 201600604U, application No. 200920202605.3, discloses a temperature controller with heating wires on a bimetallic strip. The utility model discloses an adopt the mainstream method in the existing market, twine the resistance wire outside bimetal and come the volume to increase calorific capacity, have added a heat-generating body for bimetal in other words, perhaps bimetallic strip itself just no longer the circular telegram generate heat and only lean on the resistance wire to generate heat again. It is usually designed to bimetal weld a resistance wire and sleeve it with an insulating sleeve, then manually or mechanically wind the resistance wire over the insulating sleeve, and then flatten and cut off the excess wire length at the tail.

The bimetallic strip manufactured by the method has various working procedures, the gaps among the wires of the wound bimetallic assembly are difficult to keep consistent and easy to short circuit, and the resistance value fluctuation among the same batch is large.

SUMMERY OF THE UTILITY MODEL

In order to overcome the deficiency of the background art, the utility model provides a bimetallic assembly of additional resistance.

The technical scheme of the utility model is that: including the bimetallic strip, the winding has the insulating layer around the centre of bimetallic strip, the bimetallic strip divide into contact zone, lower contact zone under the insulating layer winding, the resistance card is installed to the insulating layer, the one end welding of resistance card is in last contact zone, the resistance card becomes serpentine structure, the thickness of resistance card is unanimous.

Preferably, the first width of the serpentine structure of the resistive strip is less than 2 times the second width of the bimetallic strip.

Preferably, the first width is greater than the second width of 1 time's bimetallic strip on the snakelike structure of resistance card, the resistance card from left to right divide into resistance card left part, resistance card middle part, resistance card right part in proper order, the resistance card left part is rolled over right around the insulating layer, the resistance card right part is rolled over left around the insulating layer, the resistance card left part is relative but not contact with the resistance card right part.

Preferably, the 180-degree bend of the serpentine structure on the resistor sheet consists of 2 bend angles with 90-degree transition without round corners.

Preferably, the 180-degree bend of the serpentine structure on the resistor sheet is formed by 1 smoothly-transitioned U-shaped bend.

Preferably, the resistor disc is surrounded by insulating paint.

Preferably, the insulating layer is an insulating sleeve.

Preferably, the insulating layer is wound around the middle outer periphery of the bimetal using an insulating cloth.

Preferably, a welding point is arranged on the upper contact area, and one end of the resistor disc is electrically contacted with the upper contact area through being welded on the welding point.

The beneficial effects of the utility model are that the form that adopts the coil strip material replaces original resistance silk material, and different overall dimension can be made with the punching machine to same kind of winding according to the demand, only needs to switch the resistance value that the mould just can obtain the design. The stock specifications of various original spare resistance wires are reduced, the resistance precision control of the resistance card is extremely high, and the operating requirements of personnel are extremely low.

Drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is a rear view of the present invention.

Fig. 3 is a schematic structural diagram of the resistance card before bending.

Fig. 4 is a schematic structural diagram of the resistor disc of the present invention.

Fig. 5 is another schematic structural diagram of the resistor disc of the present invention.

In fig. 1-5, the bimetal strip 1, the upper contact area 11, the lower contact area 12, the second width 1a, the insulating layer 2, the resistive sheet 3, the first width 3a, the left resistive sheet portion 31, the middle resistive sheet portion 32, the right resistive sheet portion 33, the bent angle 34, the U-bend 35, and the welding point 4.

Detailed Description

Embodiments of the invention are further described below with reference to the accompanying drawings:

as shown in fig. 1-5, the present embodiment provides a bimetal assembly with additional resistance, which includes a bimetal strip 1, an insulating layer 2 is wound around the middle of the bimetal strip 1, the bimetal strip 1 is divided into an upper contact area 11 and a lower contact area 12 under the winding of the insulating layer 2, a resistance strip 3 is installed on the insulating layer 2, one end of the resistance strip 3 is welded on the upper contact area 11, the resistance strip 3 is in a serpentine structure, and the thicknesses of the resistance strips 3 are consistent. The other end of the resistance sheet 3 is connected with a main loop of the circuit breaker. The lower contact area 12 is not in contact with the resistive patch 3.

Here, the lower contact area 12 on the bimetal strip 1 may be in contact with the circuit breaker circuit, and the lower contact area 12 on the bimetal strip 1 may not be in breaking contact with the circuit breaker; when the lower contact area 12 of the bimetal strip 1 is in contact with the circuit of the circuit breaker, the bimetal strip 1 is also electrified to generate heat; when the lower contact area 12 of the bimetallic strip 1 is not in contact with the circuit of the circuit breaker, the bimetallic strip 1 does not generate heat due to non-electrification, and the heating of the resistance sheet 3 is transmitted to the bimetallic strip 1, so that the bimetallic strip 1 is heated, bent and deformed, and the tripping purpose is achieved.

Resistance card 3 adopts serpentine structure to be convenient for adopt the processing of coiling material, directly makes panel beating stamping die, can control serpentine structure's detailed size well, and the size of processing at every turn is unified to control resistance card 3's resistance effectively, solved the problem of resistance not good control when originally adopting the resistance wire winding.

When the current of the circuit breaker exceeds the tripping current, the heating value of the resistance sheet 3 can be rapidly increased, so that the bimetallic strip 1 is rapidly deformed, the other end of the resistance sheet 3 is separated from the main loop, and the current is cut off.

In order to increase the length of the resistive strip 3 and increase the resistance in the same volume, while preventing the resistive strip 3 from short-circuiting when the resistive strip 3 is bent, it is preferable that the first width 3a of the serpentine structure of the resistive strip 3 is less than 2 times the second width 1a of the bimetallic strip 1. Preferably, the first width 3a of the serpentine structure of the resistive sheet 3 is greater than 1 time the second width 1a of the bimetal strip 1, the resistive sheet 3 is divided into a resistive sheet left portion 31, a resistive sheet middle portion 32, and a resistive sheet right portion 33 from left to right, the resistive sheet left portion 31 is folded to the right around the insulating layer 2, the resistive sheet right portion 33 is folded to the left around the insulating layer 2, and the resistive sheet left portion 31 is opposite to but not in contact with the resistive sheet right portion 33. Thereby preventing the left resistive sheet portion 31 and the right resistive sheet portion 33 from contacting each other and causing a short circuit problem.

Since fewer fillets are more convenient for stamping and forming in the case of a sheet metal stamping die, as shown in fig. 4, it is preferable that the 180-degree bend of the serpentine structure on the resistance card 3 is composed of 2 bend angles 34 with no fillet transition at 90 degrees.

Since the resistive sheet 3 is easy to collect heat at the bending position, it is preferable to provide the resistive sheet 3 with another structure, and the 180-degree bending of the serpentine structure on the resistive sheet 3 is composed of 1 smoothly-transited U-shaped bend 35. The smooth U-shaped bend 35 is adopted to relatively disperse the heat, so that the heat can be more uniformly conducted to the bimetallic strip 1.

For some special-purpose circuit breakers, which require certain insulation requirements, the resistive sheet 3 is preferably surrounded by an insulating varnish.

Preferably, the insulating layer 2 is an insulating sleeve.

Preferably, the insulating layer 2 is wound around the middle outer circumference of the bimetal 1 using an insulating cloth.

Preferably, a welding point 4 is arranged on the upper contact area 11, and one end of the resistor disc 3 is electrically contacted with the upper contact area 11 through welding on the welding point 4.

The insulating sleeve and the insulating cloth are relatively cheap and have the performance meeting the requirements. Meanwhile, the resistance card 3 can adopt a metal plate stamping process or an automatic bending process of a strip machine.

The design adopts a coiled strip form to replace the original resistance wire material. The same winding can be punched into different overall dimensions by a punching machine according to requirements, and the designed resistance value can be obtained only by switching the dies. The stock specifications of various original spare resistance wires are reduced. The stamping precision is high, the resistance adjustment is convenient, and the width and the total length are controlled by a profile die. The punched resistance card 3 is wrapped outside the insulating layer 2 in a three-hinge mode.

The present embodiment should not be considered as a limitation of the present invention, but any modification made based on the spirit of the present invention should be within the scope of the present invention.

Claims

1. Bimetallic assembly with additional resistance, comprising a bimetallic strip (1), said bimetallic strip (1) being wound with an insulating layer (2) around the middle outer periphery, characterized in that: bimetallic strip (1) is divided into contact zone (11), lower contact zone (12) under insulating layer (2) winding, insulating layer (2) installs resistance card (3) outward, the one end welding of resistance card (3) is in last contact zone (11), resistance card (3) become snakelike structure, the thickness of resistance card (3) is unanimous.

2. The bimetal assembly of claim 1, wherein: the first width (3a) of the serpentine structure of the resistive sheet (3) is less than 2 times the second width (1a) of the bimetallic sheet (1).

3. The bimetal assembly of claim 2, wherein: first width (3a) is greater than second width (1a) of 1 time bimetallic strip (1) on the snakelike structure of resistance card (3), resistance card (3) from left to right divide into resistance card left part (31), resistance card middle part (32), resistance card right part (33) in proper order, resistance card left part (31) is rolled over right around insulating layer (2), resistance card right part (33) is rolled over left around insulating layer (2), resistance card left part (31) is relative but not contact with resistance card right part (33).

4. A resistive bimetal assembly according to claim 3, wherein: the 180-degree bend of the serpentine structure on the resistance card (3) is composed of 2 90-degree bend angles (34) without fillet transition.

5. A resistive bimetal assembly according to claim 3, wherein: the 180-degree bend of the serpentine structure on the resistance chip (3) is composed of 1 smoothly-transited U-shaped bend (35).

6. The bimetal assembly of claim 1, wherein: and insulating paint is coated on the periphery of the resistor disc (3).

7. The bimetal assembly of claim 1, wherein: the insulating layer (2) adopts an insulating sleeve.

8. The bimetal assembly of claim 1, wherein: the insulating layer (2) is wound around the middle outer periphery of the bimetallic strip (1) by adopting insulating cloth.

9. The bimetal assembly of claim 1, wherein: and a welding point (4) is arranged on the upper contact area (11), and one end of the resistor disc (3) is electrically contacted with the upper contact area (11) through being welded on the welding point (4).